Detachable Surfboard Central Fin to increase the stability and balance of the surfboard, effectively reducing the impact of the reef when paddling Slide-In Surfboard Fins has a plug-in snap-in safety reinforcement buckle, which is easy to glue the fin base to the rear end of the surfboard Surfboard SUP Fin is made of plastic, which has good wear resistance, impact resistance and water breaking, and can be stably fixed on the surfboard The size of the Surfboard Fins is 21.5x18x3.5 cm/8.46x7.09x1.38 inch, suitable for any surfboard with ordinary or American fin box The upper end of the Surfboard Accessories is fin-shaped, and the streamlined appearance effectively improves the flexibility of the surfboard, improves its turning performance, and helps you to paddle safely. Note: Due to the difference in display and lighting effects, the actual color may be slightly different from the picture. Due to manual measurement, please allow 1-3 cm deviation. Package Including 2 * Surfboard fins